The most complex integrated movement created by Patek Philippe, featured in the reference 5951P, doesn’t rely only on tradition. While it combines all of the maison’s experience in perpetual calendars and an integrated moonphase, it also adds a split-seconds chronograph that’s operated by a single button in the crown, all within a tonneau-shaped case that marks a significant visual departure from the time-tested norm of high-end Patek Philippe watchmaking. And it’s even more compelling because of it.